Tennant will attend on Saturday, April 2, only. Piper and Henstridge are scheduled for Saturday and Sunday; Schemmel, Downes, Taylor, Ferrigno and Frank will appear all three days. Additional celebrities will be announced in the coming weeks.

Other well-known Wizard World St. Louis guests include YouTube celebrities The Hillywood Show and Chris 51 ("Epic Ink"). The event will also feature major gaming activations and an eSports tournament streaming stage (www.wizardworldgaming.com).

Wizard World is also the place for cosplay, with fans young and old showing off their best costumes throughout the event. Fans dressed as every imaginable character - and some never before dreamed - will roam the convention floor. The famed Wizard World St. Louis Costume Contest will take place on Saturday night.